if Statement in c,c++,c#

if Statement 

An if statement consists of a boolean expression followed by one or more statements.
Syntax The syntax of an if statement in C#  and c ,c++ is:
if(boolean_expression)
{
   /* statement(s) will execute if the boolean expression is true */
}

Example

using System;
namespace DecisionMaking
{
   
    class Program
    {
        static void Main(string[] args)
        {
            /* local variable definition */
            int a = 10;
            /* check the boolean condition using if statement */
            if (a < 20)
            {
                /* if condition is true then print the following */
                Console.WriteLine("a is less than 20");
            }
            Console.WriteLine("value of a is : {0}", a);
            Console.ReadLine();
        }
    }
}